[POWERPC] Remove obsolete PPC_52xx and update CLASSIC32 comment

The support for the 52xx-based systems is now included under
CONFIG_CLASSIC32, since the 52xx chips have a 603e-based core.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/Kconfig

@@ -112,7 +112,7 @@ choice
 	default 6xx
 
 config CLASSIC32
-	bool "6xx/7xx/74xx"
+	bool "52xx/6xx/7xx/74xx"
 	select PPC_FPU
 	select 6xx
 	help
@@ -122,14 +122,16 @@ config CLASSIC32
 	  embedded versions (403 and 405) and the high end 64 bit Power
 	  processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
 
-	  Unless you are building a kernel for one of the embedded processor
-	  systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
-	  Note that the kernel runs in 32-bit mode even on 64-bit chips.
+	  This option is the catch-all for 6xx types, including some of the
+	  embedded versions.  Unless there is see an option for the specific
+	  chip family you are using, you want this option.
 	  
-config PPC_52xx
-	bool "Freescale 52xx"
-	select 6xx
-	select PPC_FPU
+	  You do not want this if you are building a kernel for a 64 bit
+	  IBM RS/6000 or an Apple G5, choose 6xx.
+	  
+	  If unsure, select this option
+	  
+	  Note that the kernel runs in 32-bit mode even on 64-bit chips.
 
 config PPC_82xx
 	bool "Freescale 82xx"